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moe-cache: pick a GPU device explicitly instead of the first non-meta device #11

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moe-cache: pick a GPU device explicitly instead of the first non-meta device #11

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19 changes: 18 additions & 1 deletion src/llama-model.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1705,7 +1705,24 @@ void llama_model_base::init_moe_expert_cache() {

ggml_backend_dev_t dev = nullptr;
for (const auto & d : devices) {
if (!d.is_meta) { dev = d.dev; break; }
if (!d.is_meta && ggml_backend_dev_type(d.dev) == GGML_BACKEND_DEVICE_TYPE_GPU) { dev = d.dev; break; }
}
if (dev == nullptr) {
// fallback: enumerate every backend registry, including dynamically
// loaded ones (e.g. libggml-cuda) absent from the default registry
for (size_t r = 0; r < ggml_backend_reg_count() && dev == nullptr; ++r) {
auto * reg = ggml_backend_reg_get(r);
for (size_t i = 0; i < ggml_backend_reg_dev_count(reg); ++i) {
auto * d = ggml_backend_reg_dev_get(reg, i);
if (ggml_backend_dev_type(d) == GGML_BACKEND_DEVICE_TYPE_GPU) { dev = d; break; }
}
}
if (dev == nullptr) {
for (size_t i = 0; i < ggml_backend_dev_count(); ++i) {
auto * d = ggml_backend_dev_get(i);
if (ggml_backend_dev_type(d) == GGML_BACKEND_DEVICE_TYPE_GPU) { dev = d; break; }
}
}
}
if (dev == nullptr || ggml_backend_dev_type(dev) != GGML_BACKEND_DEVICE_TYPE_GPU) {
LLAMA_LOG_WARN("%s: no GPU device - expert cache disabled\n", __func__);
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